Equipment and method for measuring coefficient of collapsibility of loess

Abstract

The invention discloses equipment and method for measuring the coefficient of collapsibility of loess, and relates to the field of civil engineering measurement equipment. The equipment comprises a reaction frame, a vertical oil jack, a centering bearing plate, a dowel steel, a bottom bearing plate and observation equipment, wherein the reaction frame comprises a reaction cross beam, a stand column and a spiral steel column; the vertical oil jack is provided with a hydraulic pressure indicator, bubble levels are arranged at four corners of the centering bearing plate; the observation equipmentcomprises a digital level and an indium steel ruler matched with the digital level; and the indium steel ruler is fixed on the dowel steel through a ruler hoop. According to the equipment, the problem that loading is easily eccentric due to existence of a force-measuring loop in the prior art can be effectively controlled by using the hydraulic gauge, and the dowel steel is directly used as waterdelivery pipe for delivering water to an exploratory well, each part of the reaction frame is connected by adopting screws with simple assembly and disassembly, and the counter force provided by utilizing the spiral steel column and the pulling resistance of a soil mass is better than that provided by utilizing dead weight of overloading.

Description

technical field [0001] The invention relates to the field of civil engineering measuring equipment, in particular to a loess collapsibility coefficient measuring equipment and a measuring method thereof. Background technique [0002] The collapsibility coefficient of loess is a mechanical parameter to evaluate the collapsibility of loess. It refers to the ratio of the height difference before and after soaking of the soil sample to the original height of the soil sample under a certain pressure, which is an important index for evaluating the collapsibility of loess. There are large areas of collapsible loess in Northwest China, but with the continuous development of economic construction, it is inevitable to build major engineering projects in Northwest China. Therefore, it is very important to test the collapsibility coefficient of loess on the construction site and evaluate the collapsibility of the site for the project design and safe construction. [0003] my country's...

AI Technical Summary

Problems solved by technology

In this application, a force-measuring ring is set between the jack and the force transmission mechanism, and the loading is easy to be eccentric and the test is inaccurate; the sections of the force transmission mechanism are connected by flanges, and the assembly is labor-intensive. Soaking in water, in actual operation, it is necessary to arrange a particularly long water delivery pipe every time, which is time-consuming, laborious and difficult; the loading method adopts the reaction mechanism with the upper part fixed to the counterweight and the jack for loading. The loading mechanism is complicated and heavy, and the loading mechanism Large-scale machinery is required for lifting, which is not only time-consuming and labor-intensive, but also has a certain disturbance to the in-situ soil layer, increasing measurement errors

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